THE FLORA: 



SELECTIONS FROM THE NATIVE AND CULTIVATED PLANTS 

 OF THE UNITED STATES. 



Designed as first exercises in Analytical Botany. 



Explanations.— The Tables in this work are designed to be corupMe, that is. each Ordinal 

 Table includes all the genera belonging to that order known -vvithin the limits of the P'lora (/. e.. the 

 States east of the Rocky Mountains); and each Generic Table includes, in like manner, all its 

 known species. The nnmbers annexed to the genera in the Ordinal Tables, refer to ihe descrip- 

 tions immediately following. If no number be annexed, the pupil will understand that that genus 

 is not further noticed. 



COHORT I. 



THE POLYPETALOUS EXOGENS. 



Essential Character. — Flowering Plants (Ph.exogamia), 

 with tlieir stems growing by additions to their outside in 

 layers (Exogens), their seeds inclosed in a seed-vessel or peri- 

 carp (Angiosperms), their flowers with a double perianth and 

 their petals distinct (Polypetal^), (But to this last condition 

 there are many exceptions.) 



Order I. RANUNCULACE.E. The Crowfoots. 



Eei-ls, rarely sJiruls, with a colorless, acrid juice, with 



leaves moiit]y alternate and much divided, without stipules; 



eepah 3-15, deciduous, distinct, and colored when apetalous; 



petals 3-15, distinct, often deformed or contracted or wanting; 



stamens <x, distinct, hypogynous ; 



pl.'itils 00 (rarely 1 or few), distinct, becoming in 



fmit either achenia, follicles, or berries. 



